I strongly suggest Gpg4win.org include a statement on its download page that Gpg4win 2.2.2 does not work on Windows XP but that Gpg4win 2.1.1 does. That will save visitors who still run XP and think Gpg4win is neat software hours of frustration.
Gpg4win 2.2.2 has a known bug making it impossible to use on Windows XP. The bug is acknowledged at http://www.wald.intevation.org/tracker/?func=detail&atid=126&aid=6564&group_id=11 near the end of the post:
Date: 2014-09-05 18:01
Sender: Andre Heinecke
The problem is indeed with us. With the update of glib we’ve included a change in glib that makes use of rand_s in the crt.
I spent four hours attempting to make 2.2.2 work on Windows XP and then searching for answers. I think a warning for XP owners is in order.